Magnetic particle based MRI thermometry at 0.2 T and 3 T.
Magn Reson Imaging
; 100: 43-54, 2023 07.
Article
em En
| MEDLINE
| ID: mdl-36933774
ABSTRACT
This study provides insight into the advantages and disadvantages of using ferrite particles embedded in agar gel phantoms as MRI temperature indicators for low-magnetic field scanners. We compare the temperature-dependent intensity of MR images at low-field (0.2 T) to those at high-field (3.0 T). Due to a shorter T1 relaxation time at low-fields, MRI scanners operating at 0.2 T can use shorter repetition times and achieve a significant T2â weighting, resulting in strong temperature-dependent changes of MR image brightness in short acquisition times. Although the signal-to-noise ratio for MR images at 0.2 T MR is much lower than at 3.0 T, it is sufficient to achieve a temperature measurement uncertainty of about ±1.0 °C at 37 °C for a 90 µg/mL concentration of magnetic particles.
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Base de dados:
MEDLINE
Assunto principal:
Imageamento por Ressonância Magnética
/
Termometria
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article